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jjlamshushushu 发表于 2014-5-30 18:05
P. J; N$ j, S7 o* N, zUL医疗插头,张力缓冲测试?测试规范呢?
& r+ y6 y2 w( y% I2 l109 Strain Relief Tests
" r$ y/ e: p# Q4 ~ H, l109.1 General
9 ?0 A) A' J( s; c- Z109.1.1 After being subjected to the strain relief tests described in this section, there shall not be any& J2 ?" `! K3 N" Y' s9 _
displacement of the conductors, conductor insulation, or outer jacket of the flexible cord exceeding 1/329 L! N- G4 t/ A7 {" Y. F1 a1 h$ T
inch (0.8 mm). There shall not be any cuts, rips, or tears in the cord insulation nor any breakage of the
; ~4 ^, C3 X; z8 o- }attachment plug that could adversely affect the enclosure of live parts, strain relief, or grounding path
- ^, H# [% r+ u9 Qintegrity.
" q+ t2 |0 _6 k. L8 {: R6 a109.2 Method A – Static pull2 V0 j, J/ y! Q6 I
109.2.1 Each of six representative attachment plugs molded onto flexible cord, without the conductors; _1 S- h+ D; _# K
terminated to the blades or grounding pin, shall be subjected to a gradually applied pull of 30 lbf (133 N)
' m R" M7 ?( Q2 ]' sto the free end of the cord while the attachment plug is securely supported. The force shall be applied for
" f, Q2 K+ u) H* c1 minute in a direction perpendicular to the plane of cord entry.
i' K+ X x; k' `109.3 Method B – Rotary pull5 K% a7 o( }9 [- \' D
109.3.1 Each of six representative attachment plugs molded onto flexible cord, without the conductors
. d) F1 v; G. i, Kterminated to the blades or grounding pin, shall be subjected to a rotary cord motion while a force of 10% S' v- X/ F E c8 z+ L
lbf (44.5 N) is applied for 2 hours. The cord is to be rotated at a rate of approximately 9 r/min in a 3 inch' n$ x: I9 Q& }( r5 O; _
diameter (76 mm) circle at a point 6 inches (152 mm) below the cord exit with the attachment plug rigidly% a0 w/ t2 X9 |4 w! ]
mounted. (Note – This test is conveniently done with UL secureness test apparatus described in the3 f$ T: [# K# U4 L8 h# W
Standard for Wire Connectors and Soldering Lugs for Use With Copper Conductors, UL 486A, or in the
7 J* K- p: R: [. D- d) o( u- g, ~' HStandard for Wire Connectors for Use With Aluminum Conductors, UL 486B.) |
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